Give em a wax job and dont store them in the attic or anywhere too humid. Hey, does standing skis upright for, say 1.5yrs warp them?
'Computer games don't affect kids; I mean if Pac-Man affected us as kids, we'd all be running around in darkened rooms, munching magic pills and listening to repetitive electronic music.' -Kristian Wilson, Nintendo, Inc, 1989
get them base ground at the end of the season, put a good think coat of wax on, iron it in really well, scrape it off...do that a couple of times to really impregnate the base with wax. Then, use a cheap travelling wax or even something like parafin wax to seal them up for the season. Strap them up and put them away in a corner so they aren't teasing you for entire summer.